

 /*
 This file '_datepicker' is part of Firebird Integrated Solution 1.0

 Copyright (c) 2015 Lincong

 Contact:  
        Email: lincong1987@gmail.com

        QQ: 159257119
 
 See Usage at http://www.jplatformx.com/firebird

 Create date: 2015-07-14 04:44
 */



 (function ($, undefined) {

     $.extend($.ui, {datepicker: {version: "1.9.2"}});

     var PROP_NAME = 'datepicker';
     var dpuuid = new Date().getTime();
     var instActive;

     /* Date picker manager.
      Use the singleton instance of this class, $.datepicker, to interact with the date picker.
      Settings for (groups of) date pickers are maintained in an instance object,
      allowing multiple different settings on the same page. */

     function Datepicker() {
         this.debug = false; // Change this to true to start debugging
         this._curInst = null; // The current instance in use
         this._keyEvent = false; // If the last event was a key event
         this._disabledInputs = []; // List of date picker inputs that have been disabled
         this._datepickerShowing = false; // True if the popup picker is showing , false if not
         this._inDialog = false; // True if showing within a "dialog", false if not
         this._mainDivId = 'ui-datepicker-div'; // The ID of the main datepicker division
         this._inlineClass = 'ui-datepicker-inline'; // The name of the inline marker class
         this._appendClass = 'ui-datepicker-append'; // The name of the append marker class
         this._triggerClass = 'ui-datepicker-trigger'; // The name of the trigger marker class
         this._dialogClass = 'ui-datepicker-dialog'; // The name of the dialog marker class
         this._disableClass = 'ui-datepicker-disabled'; // The name of the disabled covering marker class
         this._unselectableClass = 'ui-datepicker-unselectable'; // The name of the unselectable cell marker class
         this._currentClass = 'ui-datepicker-current-day'; // The name of the current day marker class
         this._dayOverClass = 'ui-datepicker-days-cell-over'; // The name of the day hover marker class
         this.regional = []; // Available regional settings, indexed by language code
         this.regional[''] = { // Default regional settings
             closeText: 'Done', // Display text for close link
             prevText: 'Prev', // Display text for previous month link
             nextText: 'Next', // Display text for next month link
             currentText: 'Today', // Display text for current month link
             monthNames: ['January', 'February', 'March', 'April', 'May', 'June',
                 'July', 'August', 'September', 'October', 'November', 'December'], // Names of months for drop-down and formatting
             monthNamesShort: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'], // For formatting
             dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'], // For formatting
             dayNamesShort: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'], // For formatting
             dayNamesMin: ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'], // Column headings for days starting at Sunday
             weekHeader: 'Wk', // Column header for week of the year
             dateFormat: 'mm/dd/yy', // See format options on parseDate
             firstDay: 0, // The first day of the week, Sun = 0, Mon = 1, ...
             isRTL: false, // True if right-to-left language, false if left-to-right
             showMonthAfterYear: false, // True if the year select precedes month, false for month then year
             yearSuffix: '' // Additional text to append to the year in the month headers
         };
         this._defaults = { // Global defaults for all the date picker instances
             showOn: 'focus', // 'focus' for popup on focus,
             // 'button' for trigger button, or 'both' for either
             showAnim: 'fadeIn', // Name of jQuery animation for popup
             showOptions: {}, // Options for enhanced animations
             defaultDate: null, // Used when field is blank: actual date,
             // +/-number for offset from today, null for today
             appendText: '', // Display text following the input box, e.g. showing the format
             buttonText: '...', // Text for trigger button
             buttonImage: '', // URL for trigger button image
             buttonImageOnly: false, // True if the image appears alone, false if it appears on a button
             hideIfNoPrevNext: false, // True to hide next/previous month links
             // if not applicable, false to just disable them
             navigationAsDateFormat: false, // True if date formatting applied to prev/today/next links
             gotoCurrent: false, // True if today link goes back to current selection instead
             changeMonth: false, // True if month can be selected directly, false if only prev/next
             changeYear: false, // True if year can be selected directly, false if only prev/next
             yearRange: 'c-10:c+10', // Range of years to display in drop-down,
             // either relative to today's year (-nn:+nn), relative to currently displayed year
             // (c-nn:c+nn), absolute (nnnn:nnnn), or a combination of the above (nnnn:-n)
             showOtherMonths: false, // True to show dates in other months, false to leave blank
             selectOtherMonths: false, // True to allow selection of dates in other months, false for unselectable
             showWeek: false, // True to show week of the year, false to not show it
             calculateWeek: this.iso8601Week, // How to calculate the week of the year,
             // takes a Date and returns the number of the week for it
             shortYearCutoff: '+10', // Short year values < this are in the current century,
             // > this are in the previous century,
             // string value starting with '+' for current year + value
             minDate: null, // The earliest selectable date, or null for no limit
             maxDate: null, // The latest selectable date, or null for no limit
             duration: 'fast', // Duration of display/closure
             beforeShowDay: null, // Function that takes a date and returns an array with
             // [0] = true if selectable, false if not, [1] = custom CSS class name(s) or '',
             // [2] = cell title (optional), e.g. $.datepicker.noWeekends
             beforeShow: null, // Function that takes an input field and
             // returns a set of custom settings for the date picker
             onSelect: null, // Define a callback function when a date is selected
             onChangeMonthYear: null, // Define a callback function when the month or year is changed
             onClose: null, // Define a callback function when the datepicker is closed
             numberOfMonths: 1, // Number of months to show at a time
             showCurrentAtPos: 0, // The position in multipe months at which to show the current month (starting at 0)
             stepMonths: 1, // Number of months to step back/forward
             stepBigMonths: 12, // Number of months to step back/forward for the big links
             altField: '', // Selector for an alternate field to store selected dates into
             altFormat: '', // The date format to use for the alternate field
             constrainInput: true, // The input is constrained by the current date format
             showButtonPanel: false, // True to show button panel, false to not show it
             autoSize: false, // True to size the input for the date format, false to leave as is
             disabled: false // The initial disabled state
         };
         $.extend(this._defaults, this.regional['']);
         this.dpDiv = bindHover($('<div id="' + this._mainDivId + '" class="ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all"></div>'));
     }

     $.extend(Datepicker.prototype, {
         /* Class name added to elements to indicate already configured with a date picker. */
         markerClassName: 'hasDatepicker',

         //Keep track of the maximum number of rows displayed (see #7043)
         maxRows: 4,

         /* Debug logging (if enabled). */
         log: function () {
             if (this.debug)
                 console.log.apply('', arguments);
         },

         // TODO rename to "widget" when switching to widget factory
         _widgetDatepicker: function () {
             return this.dpDiv;
         },

         /* Override the default settings for all instances of the date picker.
          @param  settings  object - the new settings to use as defaults (anonymous object)
          @return the manager object */
         setDefaults: function (settings) {
             extendRemove(this._defaults, settings || {});
             return this;
         },

         /* Attach the date picker to a jQuery selection.
          @param  target    element - the target input field or division or span
          @param  settings  object - the new settings to use for this date picker instance (anonymous) */
         _attachDatepicker: function (target, settings) {
             // check for settings on the control itself - in namespace 'date:'
             var inlineSettings = null;
             for (var attrName in this._defaults) {
                 var attrValue = target.getAttribute('date:' + attrName);
                 if (attrValue) {
                     inlineSettings = inlineSettings || {};
                     try {
                         inlineSettings[attrName] = eval(attrValue);
                     } catch (err) {
                         inlineSettings[attrName] = attrValue;
                     }
                 }
             }
             var nodeName = target.nodeName.toLowerCase();
             var inline = (nodeName == 'div' || nodeName == 'span');
             if (!target.id) {
                 this.uuid += 1;
                 target.id = 'dp' + this.uuid;
             }
             var inst = this._newInst($(target), inline);
             inst.settings = $.extend({}, settings || {}, inlineSettings || {});
             if (nodeName == 'input') {
                 this._connectDatepicker(target, inst);
             } else if (inline) {
                 this._inlineDatepicker(target, inst);
             }
         },

         /* Create a new instance object. */
         _newInst: function (target, inline) {
             var id = target[0].id.replace(/([^A-Za-z0-9_-])/g, '\\\\$1'); // escape jQuery meta chars
             return {
                 id: id, input: target, // associated target
                 selectedDay: 0, selectedMonth: 0, selectedYear: 0, // current selection
                 drawMonth: 0, drawYear: 0, // month being drawn
                 inline: inline, // is datepicker inline or not
                 dpDiv: (!inline ? this.dpDiv : // presentation div
                     bindHover($('<div class="' + this._inlineClass + ' ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all"></div>')))
             };
         },

         /* Attach the date picker to an input field. */
         _connectDatepicker: function (target, inst) {
             var input = $(target);
             inst.append = $([]);
             inst.trigger = $([]);
             if (input.hasClass(this.markerClassName))
                 return;
             this._attachments(input, inst);
             input.addClass(this.markerClassName).keydown(this._doKeyDown).
                 keypress(this._doKeyPress).keyup(this._doKeyUp).
                 bind("setData.datepicker", function (event, key, value) {
                     inst.settings[key] = value;
                 }).bind("getData.datepicker", function (event, key) {
                     return this._get(inst, key);
                 });
             this._autoSize(inst);
             $.data(target, PROP_NAME, inst);
             //If disabled option is true, disable the datepicker once it has been attached to the input (see ticket #5665)
             if (inst.settings.disabled) {
                 this._disableDatepicker(target);
             }
         },

         /* Make attachments based on settings. */
         _attachments: function (input, inst) {
             var appendText = this._get(inst, 'appendText');
             var isRTL = this._get(inst, 'isRTL');
             if (inst.append)
                 inst.append.remove();
             if (appendText) {
                 inst.append = $('<span class="' + this._appendClass + '">' + appendText + '</span>');
                 input[isRTL ? 'before' : 'after'](inst.append);
             }
             input.unbind('focus', this._showDatepicker);
             if (inst.trigger)
                 inst.trigger.remove();
             var showOn = this._get(inst, 'showOn');
             if (showOn == 'focus' || showOn == 'both') // pop-up date picker when in the marked field
                 input.focus(this._showDatepicker);
             if (showOn == 'button' || showOn == 'both') { // pop-up date picker when button clicked
                 var buttonText = this._get(inst, 'buttonText');
                 var buttonImage = this._get(inst, 'buttonImage');
                 inst.trigger = $(this._get(inst, 'buttonImageOnly') ?
                     $('<img/>').addClass(this._triggerClass).
                         attr({src: buttonImage, alt: buttonText, title: buttonText}) :
                     $('<button type="button"></button>').addClass(this._triggerClass).
                         html(buttonImage == '' ? buttonText : $('<img/>').attr(
                             {src: buttonImage, alt: buttonText, title: buttonText})));
                 input[isRTL ? 'before' : 'after'](inst.trigger);
                 inst.trigger.click(function () {
                     if ($.datepicker._datepickerShowing && $.datepicker._lastInput == input[0])
                         $.datepicker._hideDatepicker();
                     else if ($.datepicker._datepickerShowing && $.datepicker._lastInput != input[0]) {
                         $.datepicker._hideDatepicker();
                         $.datepicker._showDatepicker(input[0]);
                     } else
                         $.datepicker._showDatepicker(input[0]);
                     return false;
                 });
             }
         },

         /* Apply the maximum length for the date format. */
         _autoSize: function (inst) {
             if (this._get(inst, 'autoSize') && !inst.inline) {
                 var date = new Date(2009, 12 - 1, 20); // Ensure double digits
                 var dateFormat = this._get(inst, 'dateFormat');
                 if (dateFormat.match(/[DM]/)) {
                     var findMax = function (names) {
                         var max = 0;
                         var maxI = 0;
                         for (var i = 0; i < names.length; i++) {
                             if (names[i].length > max) {
                                 max = names[i].length;
                                 maxI = i;
                             }
                         }
                         return maxI;
                     };
                     date.setMonth(findMax(this._get(inst, (dateFormat.match(/MM/) ?
                         'monthNames' : 'monthNamesShort'))));
                     date.setDate(findMax(this._get(inst, (dateFormat.match(/DD/) ?
                             'dayNames' : 'dayNamesShort'))) + 20 - date.getDay());
                 }
                 inst.input.attr('size', this._formatDate(inst, date).length);
             }
         },

         /* Attach an inline date picker to a div. */
         _inlineDatepicker: function (target, inst) {
             var divSpan = $(target);
             if (divSpan.hasClass(this.markerClassName))
                 return;
             divSpan.addClass(this.markerClassName).append(inst.dpDiv).
                 bind("setData.datepicker", function (event, key, value) {
                     inst.settings[key] = value;
                 }).bind("getData.datepicker", function (event, key) {
                     return this._get(inst, key);
                 });
             $.data(target, PROP_NAME, inst);
             this._setDate(inst, this._getDefaultDate(inst), true);
             this._updateDatepicker(inst);
             this._updateAlternate(inst);
             //If disabled option is true, disable the datepicker before showing it (see ticket #5665)
             if (inst.settings.disabled) {
                 this._disableDatepicker(target);
             }
             // Set display:block in place of inst.dpDiv.show() which won't work on disconnected elements
             // http://bugs.jqueryui.com/ticket/7552 - A Datepicker created on a detached div has zero height
             inst.dpDiv.css("display", "block");
         },

         /* Pop-up the date picker in a "dialog" box.
          @param  input     element - ignored
          @param  date      string or Date - the initial date to display
          @param  onSelect  function - the function to call when a date is selected
          @param  settings  object - update the dialog date picker instance's settings (anonymous object)
          @param  pos       int[2] - coordinates for the dialog's position within the screen or
          event - with x/y coordinates or
          leave empty for default (screen centre)
          @return the manager object */
         _dialogDatepicker: function (input, date, onSelect, settings, pos) {
             var inst = this._dialogInst; // internal instance
             if (!inst) {
                 this.uuid += 1;
                 var id = 'dp' + this.uuid;
                 this._dialogInput = $('<input type="text" id="' + id +
                     '" style="position: absolute; top: -100px; width: 0px;"/>');
                 this._dialogInput.keydown(this._doKeyDown);
                 $('body').append(this._dialogInput);
                 inst = this._dialogInst = this._newInst(this._dialogInput, false);
                 inst.settings = {};
                 $.data(this._dialogInput[0], PROP_NAME, inst);
             }
             extendRemove(inst.settings, settings || {});
             date = (date && date.constructor == Date ? this._formatDate(inst, date) : date);
             this._dialogInput.val(date);

             this._pos = (pos ? (pos.length ? pos : [pos.pageX, pos.pageY]) : null);
             if (!this._pos) {
                 var browserWidth = document.documentElement.clientWidth;
                 var browserHeight = document.documentElement.clientHeight;
                 var scrollX = document.documentElement.scrollLeft || document.body.scrollLeft;
                 var scrollY = document.documentElement.scrollTop || document.body.scrollTop;
                 this._pos = // should use actual width/height below
                     [(browserWidth / 2) - 100 + scrollX, (browserHeight / 2) - 150 + scrollY];
             }

             // move input on screen for focus, but hidden behind dialog
             this._dialogInput.css('left', (this._pos[0] + 20) + 'px').css('top', this._pos[1] + 'px');
             inst.settings.onSelect = onSelect;
             this._inDialog = true;
             this.dpDiv.addClass(this._dialogClass);
             this._showDatepicker(this._dialogInput[0]);
             if ($.blockUI)
                 $.blockUI(this.dpDiv);
             $.data(this._dialogInput[0], PROP_NAME, inst);
             return this;
         },

         /* Detach a datepicker from its control.
          @param  target    element - the target input field or division or span */
         _destroyDatepicker: function (target) {
             var $target = $(target);
             var inst = $.data(target, PROP_NAME);
             if (!$target.hasClass(this.markerClassName)) {
                 return;
             }
             var nodeName = target.nodeName.toLowerCase();
             $.removeData(target, PROP_NAME);
             if (nodeName == 'input') {
                 inst.append.remove();
                 inst.trigger.remove();
                 $target.removeClass(this.markerClassName).
                     unbind('focus', this._showDatepicker).
                     unbind('keydown', this._doKeyDown).
                     unbind('keypress', this._doKeyPress).
                     unbind('keyup', this._doKeyUp);
             } else if (nodeName == 'div' || nodeName == 'span')
                 $target.removeClass(this.markerClassName).empty();
         },

         /* Enable the date picker to a jQuery selection.
          @param  target    element - the target input field or division or span */
         _enableDatepicker: function (target) {
             var $target = $(target);
             var inst = $.data(target, PROP_NAME);
             if (!$target.hasClass(this.markerClassName)) {
                 return;
             }
             var nodeName = target.nodeName.toLowerCase();
             if (nodeName == 'input') {
                 target.disabled = false;
                 inst.trigger.filter('button').
                     each(function () {
                         this.disabled = false;
                     }).end().
                     filter('img').css({opacity: '1.0', cursor: ''});
             }
             else if (nodeName == 'div' || nodeName == 'span') {
                 var inline = $target.children('.' + this._inlineClass);
                 inline.children().removeClass('ui-state-disabled');
                 inline.find("select.ui-datepicker-month, select.ui-datepicker-year").
                     prop("disabled", false);
             }
             this._disabledInputs = $.map(this._disabledInputs,
                 function (value) {
                     return (value == target ? null : value);
                 }); // delete entry
         },

         /* Disable the date picker to a jQuery selection.
          @param  target    element - the target input field or division or span */
         _disableDatepicker: function (target) {
             var $target = $(target);
             var inst = $.data(target, PROP_NAME);
             if (!$target.hasClass(this.markerClassName)) {
                 return;
             }
             var nodeName = target.nodeName.toLowerCase();
             if (nodeName == 'input') {
                 target.disabled = true;
                 inst.trigger.filter('button').
                     each(function () {
                         this.disabled = true;
                     }).end().
                     filter('img').css({opacity: '0.5', cursor: 'default'});
             }
             else if (nodeName == 'div' || nodeName == 'span') {
                 var inline = $target.children('.' + this._inlineClass);
                 inline.children().addClass('ui-state-disabled');
                 inline.find("select.ui-datepicker-month, select.ui-datepicker-year").
                     prop("disabled", true);
             }
             this._disabledInputs = $.map(this._disabledInputs,
                 function (value) {
                     return (value == target ? null : value);
                 }); // delete entry
             this._disabledInputs[this._disabledInputs.length] = target;
         },

         /* Is the first field in a jQuery collection disabled as a datepicker?
          @param  target    element - the target input field or division or span
          @return boolean - true if disabled, false if enabled */
         _isDisabledDatepicker: function (target) {
             if (!target) {
                 return false;
             }
             for (var i = 0; i < this._disabledInputs.length; i++) {
                 if (this._disabledInputs[i] == target)
                     return true;
             }
             return false;
         },

         /* Retrieve the instance data for the target control.
          @param  target  element - the target input field or division or span
          @return  object - the associated instance data
          @throws  error if a jQuery problem getting data */
         _getInst: function (target) {
             try {
                 return $.data(target, PROP_NAME);
             }
             catch (err) {
                 throw 'Missing instance data for this datepicker';
             }
         },

         /* Update or retrieve the settings for a date picker attached to an input field or division.
          @param  target  element - the target input field or division or span
          @param  name    object - the new settings to update or
          string - the name of the setting to change or retrieve,
          when retrieving also 'all' for all instance settings or
          'defaults' for all global defaults
          @param  value   any - the new value for the setting
          (omit if above is an object or to retrieve a value) */
         _optionDatepicker: function (target, name, value) {
             var inst = this._getInst(target);
             if (arguments.length == 2 && typeof name == 'string') {
                 return (name == 'defaults' ? $.extend({}, $.datepicker._defaults) :
                     (inst ? (name == 'all' ? $.extend({}, inst.settings) :
                         this._get(inst, name)) : null));
             }
             var settings = name || {};
             if (typeof name == 'string') {
                 settings = {};
                 settings[name] = value;
             }
             if (inst) {
                 if (this._curInst == inst) {
                     this._hideDatepicker();
                 }
                 var date = this._getDateDatepicker(target, true);
                 var minDate = this._getMinMaxDate(inst, 'min');
                 var maxDate = this._getMinMaxDate(inst, 'max');
                 extendRemove(inst.settings, settings);
                 // reformat the old minDate/maxDate values if dateFormat changes and a new minDate/maxDate isn't provided
                 if (minDate !== null && settings['dateFormat'] !== undefined && settings['minDate'] === undefined)
                     inst.settings.minDate = this._formatDate(inst, minDate);
                 if (maxDate !== null && settings['dateFormat'] !== undefined && settings['maxDate'] === undefined)
                     inst.settings.maxDate = this._formatDate(inst, maxDate);
                 this._attachments($(target), inst);
                 this._autoSize(inst);
                 this._setDate(inst, date);
                 this._updateAlternate(inst);
                 this._updateDatepicker(inst);
             }
         },

         // change method deprecated
         _changeDatepicker: function (target, name, value) {
             this._optionDatepicker(target, name, value);
         },

         /* Redraw the date picker attached to an input field or division.
          @param  target  element - the target input field or division or span */
         _refreshDatepicker: function (target) {
             var inst = this._getInst(target);
             if (inst) {
                 this._updateDatepicker(inst);
             }
         },

         /* Set the dates for a jQuery selection.
          @param  target   element - the target input field or division or span
          @param  date     Date - the new date */
         _setDateDatepicker: function (target, date) {
             var inst = this._getInst(target);
             if (inst) {
                 this._setDate(inst, date);
                 this._updateDatepicker(inst);
                 this._updateAlternate(inst);
             }
         },

         /* Get the date(s) for the first entry in a jQuery selection.
          @param  target     element - the target input field or division or span
          @param  noDefault  boolean - true if no default date is to be used
          @return Date - the current date */
         _getDateDatepicker: function (target, noDefault) {
             var inst = this._getInst(target);
             if (inst && !inst.inline)
                 this._setDateFromField(inst, noDefault);
             return (inst ? this._getDate(inst) : null);
         },

         /* Handle keystrokes. */
         _doKeyDown: function (event) {
             var inst = $.datepicker._getInst(event.target);
             var handled = true;
             var isRTL = inst.dpDiv.is('.ui-datepicker-rtl');
             inst._keyEvent = true;
             if ($.datepicker._datepickerShowing)
                 switch (event.keyCode) {
                     case 9:
                         $.datepicker._hideDatepicker();
                         handled = false;
                         break; // hide on tab out
                     case 13:
                         var sel = $('td.' + $.datepicker._dayOverClass + ':not(.' +
                             $.datepicker._currentClass + ')', inst.dpDiv);
                         if (sel[0])
                             $.datepicker._selectDay(event.target, inst.selectedMonth, inst.selectedYear, sel[0]);
                         var onSelect = $.datepicker._get(inst, 'onSelect');
                         if (onSelect) {
                             var dateStr = $.datepicker._formatDate(inst);

                             // trigger custom callback
                             onSelect.apply((inst.input ? inst.input[0] : null), [dateStr, inst]);
                         }
                         else
                             $.datepicker._hideDatepicker();
                         return false; // don't submit the form
                         break; // select the value on enter
                     case 27:
                         $.datepicker._hideDatepicker();
                         break; // hide on escape
                     case 33:
                         $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                             -$.datepicker._get(inst, 'stepBigMonths') :
                             -$.datepicker._get(inst, 'stepMonths')), 'M');
                         break; // previous month/year on page up/+ ctrl
                     case 34:
                         $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                             +$.datepicker._get(inst, 'stepBigMonths') :
                             +$.datepicker._get(inst, 'stepMonths')), 'M');
                         break; // next month/year on page down/+ ctrl
                     case 35:
                         if (event.ctrlKey || event.metaKey) $.datepicker._clearDate(event.target);
                         handled = event.ctrlKey || event.metaKey;
                         break; // clear on ctrl or command +end
                     case 36:
                         if (event.ctrlKey || event.metaKey) $.datepicker._gotoToday(event.target);
                         handled = event.ctrlKey || event.metaKey;
                         break; // current on ctrl or command +home
                     case 37:
                         if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, (isRTL ? +1 : -1), 'D');
                         handled = event.ctrlKey || event.metaKey;
                         // -1 day on ctrl or command +left
                         if (event.originalEvent.altKey) $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                             -$.datepicker._get(inst, 'stepBigMonths') :
                             -$.datepicker._get(inst, 'stepMonths')), 'M');
                         // next month/year on alt +left on Mac
                         break;
                     case 38:
                         if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, -7, 'D');
                         handled = event.ctrlKey || event.metaKey;
                         break; // -1 week on ctrl or command +up
                     case 39:
                         if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, (isRTL ? -1 : +1), 'D');
                         handled = event.ctrlKey || event.metaKey;
                         // +1 day on ctrl or command +right
                         if (event.originalEvent.altKey) $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                             +$.datepicker._get(inst, 'stepBigMonths') :
                             +$.datepicker._get(inst, 'stepMonths')), 'M');
                         // next month/year on alt +right
                         break;
                     case 40:
                         if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, +7, 'D');
                         handled = event.ctrlKey || event.metaKey;
                         break; // +1 week on ctrl or command +down
                     default:
                         handled = false;
                 }
             else if (event.keyCode == 36 && event.ctrlKey) // display the date picker on ctrl+home
                 $.datepicker._showDatepicker(this);
             else {
                 handled = false;
             }
             if (handled) {
                 event.preventDefault();
                 event.stopPropagation();
             }
         },

         /* Filter entered characters - based on date format. */
         _doKeyPress: function (event) {
             var inst = $.datepicker._getInst(event.target);
             if ($.datepicker._get(inst, 'constrainInput')) {
                 var chars = $.datepicker._possibleChars($.datepicker._get(inst, 'dateFormat'));
                 var chr = String.fromCharCode(event.charCode == undefined ? event.keyCode : event.charCode);
                 return event.ctrlKey || event.metaKey || (chr < ' ' || !chars || chars.indexOf(chr) > -1);
             }
         },

         /* Synchronise manual entry and field/alternate field. */
         _doKeyUp: function (event) {
             var inst = $.datepicker._getInst(event.target);
             if (inst.input.val() != inst.lastVal) {
                 try {
                     var date = $.datepicker.parseDate($.datepicker._get(inst, 'dateFormat'),
                         (inst.input ? inst.input.val() : null),
                         $.datepicker._getFormatConfig(inst));
                     if (date) { // only if valid
                         $.datepicker._setDateFromField(inst);
                         $.datepicker._updateAlternate(inst);
                         $.datepicker._updateDatepicker(inst);
                     }
                 }
                 catch (err) {
                     $.datepicker.log(err);
                 }
             }
             return true;
         },

         /* Pop-up the date picker for a given input field.
          If false returned from beforeShow event handler do not show.
          @param  input  element - the input field attached to the date picker or
          event - if triggered by focus */
         _showDatepicker: function (input) {
             input = input.target || input;
             if (input.nodeName.toLowerCase() != 'input') // find from button/image trigger
                 input = $('input', input.parentNode)[0];
             if ($.datepicker._isDisabledDatepicker(input) || $.datepicker._lastInput == input) // already here
                 return;
             var inst = $.datepicker._getInst(input);
             if ($.datepicker._curInst && $.datepicker._curInst != inst) {
                 $.datepicker._curInst.dpDiv.stop(true, true);
                 if (inst && $.datepicker._datepickerShowing) {
                     $.datepicker._hideDatepicker($.datepicker._curInst.input[0]);
                 }
             }
             var beforeShow = $.datepicker._get(inst, 'beforeShow');
             var beforeShowSettings = beforeShow ? beforeShow.apply(input, [input, inst]) : {};
             if (beforeShowSettings === false) {
                 //false
                 return;
             }
             extendRemove(inst.settings, beforeShowSettings);
             inst.lastVal = null;
             $.datepicker._lastInput = input;
             $.datepicker._setDateFromField(inst);
             if ($.datepicker._inDialog) // hide cursor
                 input.value = '';
             if (!$.datepicker._pos) { // position below input
                 $.datepicker._pos = $.datepicker._findPos(input);
                 $.datepicker._pos[1] += input.offsetHeight; // add the height
             }
             var isFixed = false;
             $(input).parents().each(function () {
                 isFixed |= $(this).css('position') == 'fixed';
                 return !isFixed;
             });
             var offset = {left: $.datepicker._pos[0], top: $.datepicker._pos[1]};
             $.datepicker._pos = null;
             //to avoid flashes on Firefox
             inst.dpDiv.empty();
             // determine sizing offscreen
             inst.dpDiv.css({position: 'absolute', display: 'block', top: '-1000px'});
             $.datepicker._updateDatepicker(inst);
             // fix width for dynamic number of date pickers
             // and adjust position before showing
             offset = $.datepicker._checkOffset(inst, offset, isFixed);
             inst.dpDiv.css({
                 position: ($.datepicker._inDialog && $.blockUI ?
                     'static' : (isFixed ? 'fixed' : 'absolute')), display: 'none',
                 left: offset.left + 'px', top: offset.top + 'px'
             });
             if (!inst.inline) {
                 var showAnim = $.datepicker._get(inst, 'showAnim');
                 var duration = $.datepicker._get(inst, 'duration');
                 var postProcess = function () {
                     var cover = inst.dpDiv.find('iframe.ui-datepicker-cover'); // IE6- only
                     if (!!cover.length) {
                         var borders = $.datepicker._getBorders(inst.dpDiv);
                         cover.css({
                             left: -borders[0], top: -borders[1],
                             width: inst.dpDiv.outerWidth(), height: inst.dpDiv.outerHeight()
                         });
                     }
                 };
                 inst.dpDiv.zIndex($(input).zIndex() + 1);
                 $.datepicker._datepickerShowing = true;

                 // DEPRECATED: after BC for 1.8.x $.effects[ showAnim ] is not needed
                 if ($.effects && ( $.effects.effect[showAnim] || $.effects[showAnim] ))
                     inst.dpDiv.show(showAnim, $.datepicker._get(inst, 'showOptions'), duration, postProcess);
                 else
                     inst.dpDiv[showAnim || 'show']((showAnim ? duration : null), postProcess);
                 if (!showAnim || !duration)
                     postProcess();
                 if (inst.input.is(':visible') && !inst.input.is(':disabled'))
                     inst.input.focus();
                 $.datepicker._curInst = inst;
             }
         },

         /* Generate the date picker content. */
         _updateDatepicker: function (inst) {
             this.maxRows = 4; //Reset the max number of rows being displayed (see #7043)
             var borders = $.datepicker._getBorders(inst.dpDiv);
             instActive = inst; // for delegate hover events
             inst.dpDiv.empty().append(this._generateHTML(inst));
             this._attachHandlers(inst);
             var cover = inst.dpDiv.find('iframe.ui-datepicker-cover'); // IE6- only
             if (!!cover.length) { //avoid call to outerXXXX() when not in IE6
                 cover.css({
                     left: -borders[0],
                     top: -borders[1],
                     width: inst.dpDiv.outerWidth(),
                     height: inst.dpDiv.outerHeight()
                 })
             }
             inst.dpDiv.find('.' + this._dayOverClass + ' a').mouseover();
             var numMonths = this._getNumberOfMonths(inst);
             var cols = numMonths[1];
             var width = 17;
             inst.dpDiv.removeClass('ui-datepicker-multi-2 ui-datepicker-multi-3 ui-datepicker-multi-4').width('');
             if (cols > 1)
                 inst.dpDiv.addClass('ui-datepicker-multi-' + cols).css('width', (width * cols) + 'em');
             inst.dpDiv[(numMonths[0] != 1 || numMonths[1] != 1 ? 'add' : 'remove') +
             'Class']('ui-datepicker-multi');
             inst.dpDiv[(this._get(inst, 'isRTL') ? 'add' : 'remove') +
             'Class']('ui-datepicker-rtl');
             if (inst == $.datepicker._curInst && $.datepicker._datepickerShowing && inst.input &&
                     // #6694 - don't focus the input if it's already focused
                     // this breaks the change event in IE
                 inst.input.is(':visible') && !inst.input.is(':disabled') && inst.input[0] != document.activeElement)
                 inst.input.focus();
             // deffered render of the years select (to avoid flashes on Firefox)
             if (inst.yearshtml) {
                 var origyearshtml = inst.yearshtml;
                 setTimeout(function () {
                     //assure that inst.yearshtml didn't change.
                     if (origyearshtml === inst.yearshtml && inst.yearshtml) {
                         inst.dpDiv.find('select.ui-datepicker-year:first').replaceWith(inst.yearshtml);
                     }
                     origyearshtml = inst.yearshtml = null;
                 }, 0);
             }
         },

         /* Retrieve the size of left and top borders for an element.
          @param  elem  (jQuery object) the element of interest
          @return  (number[2]) the left and top borders */
         _getBorders: function (elem) {
             var convert = function (value) {
                 return {thin: 1, medium: 2, thick: 3}[value] || value;
             };
             return [parseFloat(convert(elem.css('border-left-width'))),
                 parseFloat(convert(elem.css('border-top-width')))];
         },

         /* Check positioning to remain on screen. */
         _checkOffset: function (inst, offset, isFixed) {
             var dpWidth = inst.dpDiv.outerWidth();
             var dpHeight = inst.dpDiv.outerHeight();
             var inputWidth = inst.input ? inst.input.outerWidth() : 0;
             var inputHeight = inst.input ? inst.input.outerHeight() : 0;
             var viewWidth = document.documentElement.clientWidth + (isFixed ? 0 : $(document).scrollLeft());
             var viewHeight = document.documentElement.clientHeight + (isFixed ? 0 : $(document).scrollTop());

             offset.left -= (this._get(inst, 'isRTL') ? (dpWidth - inputWidth) : 0);
             offset.left -= (isFixed && offset.left == inst.input.offset().left) ? $(document).scrollLeft() : 0;
             offset.top -= (isFixed && offset.top == (inst.input.offset().top + inputHeight)) ? $(document).scrollTop() : 0;

             // now check if datepicker is showing outside window viewport - move to a better place if so.
             offset.left -= Math.min(offset.left, (offset.left + dpWidth > viewWidth && viewWidth > dpWidth) ?
                 Math.abs(offset.left + dpWidth - viewWidth) : 0);
             offset.top -= Math.min(offset.top, (offset.top + dpHeight > viewHeight && viewHeight > dpHeight) ?
                 Math.abs(dpHeight + inputHeight) : 0);

             return offset;
         },

         /* Find an object's position on the screen. */
         _findPos: function (obj) {
             var inst = this._getInst(obj);
             var isRTL = this._get(inst, 'isRTL');
             while (obj && (obj.type == 'hidden' || obj.nodeType != 1 || $.expr.filters.hidden(obj))) {
                 obj = obj[isRTL ? 'previousSibling' : 'nextSibling'];
             }
             var position = $(obj).offset();
             return [position.left, position.top];
         },

         /* Hide the date picker from view.
          @param  input  element - the input field attached to the date picker */
         _hideDatepicker: function (input) {
             var inst = this._curInst;
             if (!inst || (input && inst != $.data(input, PROP_NAME)))
                 return;
             if (this._datepickerShowing) {
                 var showAnim = this._get(inst, 'showAnim');
                 var duration = this._get(inst, 'duration');
                 var postProcess = function () {
                     $.datepicker._tidyDialog(inst);
                 };

                 // DEPRECATED: after BC for 1.8.x $.effects[ showAnim ] is not needed
                 if ($.effects && ( $.effects.effect[showAnim] || $.effects[showAnim] ))
                     inst.dpDiv.hide(showAnim, $.datepicker._get(inst, 'showOptions'), duration, postProcess);
                 else
                     inst.dpDiv[(showAnim == 'slideDown' ? 'slideUp' :
                         (showAnim == 'fadeIn' ? 'fadeOut' : 'hide'))]((showAnim ? duration : null), postProcess);
                 if (!showAnim)
                     postProcess();
                 this._datepickerShowing = false;
                 var onClose = this._get(inst, 'onClose');
                 if (onClose)
                     onClose.apply((inst.input ? inst.input[0] : null),
                         [(inst.input ? inst.input.val() : ''), inst]);
                 this._lastInput = null;
                 if (this._inDialog) {
                     this._dialogInput.css({position: 'absolute', left: '0', top: '-100px'});
                     if ($.blockUI) {
                         $.unblockUI();
                         $('body').append(this.dpDiv);
                     }
                 }
                 this._inDialog = false;
             }
         },

         /* Tidy up after a dialog display. */
         _tidyDialog: function (inst) {
             inst.dpDiv.removeClass(this._dialogClass).unbind('.ui-datepicker-calendar');
         },

         /* Close date picker if clicked elsewhere. */
         _checkExternalClick: function (event) {
             if (!$.datepicker._curInst)
                 return;

             var $target = $(event.target),
                 inst = $.datepicker._getInst($target[0]);

             if (( ( $target[0].id != $.datepicker._mainDivId &&
                 $target.parents('#' + $.datepicker._mainDivId).length == 0 && !$target.hasClass($.datepicker.markerClassName) && !$target.closest("." + $.datepicker._triggerClass).length &&
                 $.datepicker._datepickerShowing && !($.datepicker._inDialog && $.blockUI) ) ) ||
                 ( $target.hasClass($.datepicker.markerClassName) && $.datepicker._curInst != inst ))
                 $.datepicker._hideDatepicker();
         },

         /* Adjust one of the date sub-fields. */
         _adjustDate: function (id, offset, period) {
             var target = $(id);
             var inst = this._getInst(target[0]);
             if (this._isDisabledDatepicker(target[0])) {
                 return;
             }
             this._adjustInstDate(inst, offset +
                 (period == 'M' ? this._get(inst, 'showCurrentAtPos') : 0), // undo positioning
                 period);
             this._updateDatepicker(inst);
         },

         /* Action for current link. */
         _gotoToday: function (id) {
             var target = $(id);
             var inst = this._getInst(target[0]);
             if (this._get(inst, 'gotoCurrent') && inst.currentDay) {
                 inst.selectedDay = inst.currentDay;
                 inst.drawMonth = inst.selectedMonth = inst.currentMonth;
                 inst.drawYear = inst.selectedYear = inst.currentYear;
             }
             else {
                 var date = new Date();
                 inst.selectedDay = date.getDate();
                 inst.drawMonth = inst.selectedMonth = date.getMonth();
                 inst.drawYear = inst.selectedYear = date.getFullYear();
             }
             this._notifyChange(inst);
             this._adjustDate(target);
         },

         /* Action for selecting a new month/year. */
         _selectMonthYear: function (id, select, period) {
             var target = $(id);
             var inst = this._getInst(target[0]);
             inst['selected' + (period == 'M' ? 'Month' : 'Year')] =
                 inst['draw' + (period == 'M' ? 'Month' : 'Year')] =
                     parseInt(select.options[select.selectedIndex].value, 10);
             this._notifyChange(inst);
             this._adjustDate(target);
         },

         /* Action for selecting a day. */
         _selectDay: function (id, month, year, td) {
             var target = $(id);
             if ($(td).hasClass(this._unselectableClass) || this._isDisabledDatepicker(target[0])) {
                 return;
             }
             var inst = this._getInst(target[0]);
             inst.selectedDay = inst.currentDay = $('a', td).html();
             inst.selectedMonth = inst.currentMonth = month;
             inst.selectedYear = inst.currentYear = year;
             this._selectDate(id, this._formatDate(inst,
                 inst.currentDay, inst.currentMonth, inst.currentYear));
         },

         /* Erase the input field and hide the date picker. */
         _clearDate: function (id) {
             var target = $(id);
             var inst = this._getInst(target[0]);
             this._selectDate(target, '');
         },

         /* Update the input field with the selected date. */
         _selectDate: function (id, dateStr) {
             var target = $(id);
             var inst = this._getInst(target[0]);
             dateStr = (dateStr != null ? dateStr : this._formatDate(inst));
             if (inst.input)
                 inst.input.val(dateStr);
             this._updateAlternate(inst);
             var onSelect = this._get(inst, 'onSelect');
             if (onSelect)
                 onSelect.apply((inst.input ? inst.input[0] : null), [dateStr, inst]);  // trigger custom callback
             else if (inst.input)
                 inst.input.trigger('change'); // fire the change event
             if (inst.inline)
                 this._updateDatepicker(inst);
             else {
                 this._hideDatepicker();
                 this._lastInput = inst.input[0];
                 if (typeof(inst.input[0]) != 'object')
                     inst.input.focus(); // restore focus
                 this._lastInput = null;
             }
         },

         /* Update any alternate field to synchronise with the main field. */
         _updateAlternate: function (inst) {
             var altField = this._get(inst, 'altField');
             if (altField) { // update alternate field too
                 var altFormat = this._get(inst, 'altFormat') || this._get(inst, 'dateFormat');
                 var date = this._getDate(inst);
                 var dateStr = this.formatDate(altFormat, date, this._getFormatConfig(inst));
                 $(altField).each(function () {
                     $(this).val(dateStr);
                 });
             }
         },

         /* Set as beforeShowDay function to prevent selection of weekends.
          @param  date  Date - the date to customise
          @return [boolean, string] - is this date selectable?, what is its CSS class? */
         noWeekends: function (date) {
             var day = date.getDay();
             return [(day > 0 && day < 6), ''];
         },

         /* Set as calculateWeek to determine the week of the year based on the ISO 8601 definition.
          @param  date  Date - the date to get the week for
          @return  number - the number of the week within the year that contains this date */
         iso8601Week: function (date) {
             var checkDate = new Date(date.getTime());
             // Find Thursday of this week starting on Monday
             checkDate.setDate(checkDate.getDate() + 4 - (checkDate.getDay() || 7));
             var time = checkDate.getTime();
             checkDate.setMonth(0); // Compare with Jan 1
             checkDate.setDate(1);
             return Math.floor(Math.round((time - checkDate) / 86400000) / 7) + 1;
         },

         /* Parse a string value into a date object.
          See formatDate below for the possible formats.

          @param  format    string - the expected format of the date
          @param  value     string - the date in the above format
          @param  settings  Object - attributes include:
          shortYearCutoff  number - the cutoff year for determining the century (optional)
          dayNamesShort    string[7] - abbreviated names of the days from Sunday (optional)
          dayNames         string[7] - names of the days from Sunday (optional)
          monthNamesShort  string[12] - abbreviated names of the months (optional)
          monthNames       string[12] - names of the months (optional)
          @return  Date - the extracted date value or null if value is blank */
         parseDate: function (format, value, settings) {
             if (format == null || value == null)
                 throw 'Invalid arguments';
             value = (typeof value == 'object' ? value.toString() : value + '');
             if (value == '')
                 return null;
             var shortYearCutoff = (settings ? settings.shortYearCutoff : null) || this._defaults.shortYearCutoff;
             shortYearCutoff = (typeof shortYearCutoff != 'string' ? shortYearCutoff :
             new Date().getFullYear() % 100 + parseInt(shortYearCutoff, 10));
             var dayNamesShort = (settings ? settings.dayNamesShort : null) || this._defaults.dayNamesShort;
             var dayNames = (settings ? settings.dayNames : null) || this._defaults.dayNames;
             var monthNamesShort = (settings ? settings.monthNamesShort : null) || this._defaults.monthNamesShort;
             var monthNames = (settings ? settings.monthNames : null) || this._defaults.monthNames;
             var year = -1;
             var month = -1;
             var day = -1;
             var doy = -1;
             var literal = false;
             // Check whether a format character is doubled
             var lookAhead = function (match) {
                 var matches = (iFormat + 1 < format.length && format.charAt(iFormat + 1) == match);
                 if (matches)
                     iFormat++;
                 return matches;
             };
             // Extract a number from the string value
             var getNumber = function (match) {
                 var isDoubled = lookAhead(match);
                 var size = (match == '@' ? 14 : (match == '!' ? 20 :
                     (match == 'y' && isDoubled ? 4 : (match == 'o' ? 3 : 2))));
                 var digits = new RegExp('^\\d{1,' + size + '}');
                 var num = value.substring(iValue).match(digits);
                 if (!num)
                     throw 'Missing number at position ' + iValue;
                 iValue += num[0].length;
                 return parseInt(num[0], 10);
             };
             // Extract a name from the string value and convert to an index
             var getName = function (match, shortNames, longNames) {
                 var names = $.map(lookAhead(match) ? longNames : shortNames, function (v, k) {
                     return [[k, v]];
                 }).sort(function (a, b) {
                     return -(a[1].length - b[1].length);
                 });
                 var index = -1;
                 $.each(names, function (i, pair) {
                     var name = pair[1];
                     if (value.substr(iValue, name.length).toLowerCase() == name.toLowerCase()) {
                         index = pair[0];
                         iValue += name.length;
                         return false;
                     }
                 });
                 if (index != -1)
                     return index + 1;
                 else
                     throw 'Unknown name at position ' + iValue;
             };
             // Confirm that a literal character matches the string value
             var checkLiteral = function () {
                 if (value.charAt(iValue) != format.charAt(iFormat))
                     throw 'Unexpected literal at position ' + iValue;
                 iValue++;
             };
             var iValue = 0;
             for (var iFormat = 0; iFormat < format.length; iFormat++) {
                 if (literal)
                     if (format.charAt(iFormat) == "'" && !lookAhead("'"))
                         literal = false;
                     else
                         checkLiteral();
                 else
                     switch (format.charAt(iFormat)) {
                         case 'd':
                             day = getNumber('d');
                             break;
                         case 'D':
                             getName('D', dayNamesShort, dayNames);
                             break;
                         case 'o':
                             doy = getNumber('o');
                             break;
                         case 'm':
                             month = getNumber('m');
                             break;
                         case 'M':
                             month = getName('M', monthNamesShort, monthNames);
                             break;
                         case 'y':
                             year = getNumber('y');
                             break;
                         case '@':
                             var date = new Date(getNumber('@'));
                             year = date.getFullYear();
                             month = date.getMonth() + 1;
                             day = date.getDate();
                             break;
                         case '!':
                             var date = new Date((getNumber('!') - this._ticksTo1970) / 10000);
                             year = date.getFullYear();
                             month = date.getMonth() + 1;
                             day = date.getDate();
                             break;
                         case "'":
                             if (lookAhead("'"))
                                 checkLiteral();
                             else
                                 literal = true;
                             break;
                         default:
                             checkLiteral();
                     }
             }
             if (iValue < value.length) {
                 var extra = value.substr(iValue);
                 if (!/^\s+/.test(extra)) {
                     throw "Extra/unparsed characters found in date: " + extra;
                 }
             }
             if (year == -1)
                 year = new Date().getFullYear();
             else if (year < 100)
                 year += new Date().getFullYear() - new Date().getFullYear() % 100 +
                     (year <= shortYearCutoff ? 0 : -100);
             if (doy > -1) {
                 month = 1;
                 day = doy;
                 do {
                     var dim = this._getDaysInMonth(year, month - 1);
                     if (day <= dim)
                         break;
                     month++;
                     day -= dim;
                 } while (true);
             }
             var date = this._daylightSavingAdjust(new Date(year, month - 1, day));
             if (date.getFullYear() != year || date.getMonth() + 1 != month || date.getDate() != day)
                 throw 'Invalid date'; // E.g. 31/02/00
             return date;
         },

         /* Standard date formats. */
         ATOM: 'yy-mm-dd', // RFC 3339 (ISO 8601)
         COOKIE: 'D, dd M yy',
         ISO_8601: 'yy-mm-dd',
         RFC_822: 'D, d M y',
         RFC_850: 'DD, dd-M-y',
         RFC_1036: 'D, d M y',
         RFC_1123: 'D, d M yy',
         RFC_2822: 'D, d M yy',
         RSS: 'D, d M y', // RFC 822
         TICKS: '!',
         TIMESTAMP: '@',
         W3C: 'yy-mm-dd', // ISO 8601

         _ticksTo1970: (((1970 - 1) * 365 + Math.floor(1970 / 4) - Math.floor(1970 / 100) +
         Math.floor(1970 / 400)) * 24 * 60 * 60 * 10000000),

         /* Format a date object into a string value.
          The format can be combinations of the following:
          d  - day of month (no leading zero)
          dd - day of month (two digit)
          o  - day of year (no leading zeros)
          oo - day of year (three digit)
          D  - day name short
          DD - day name long
          m  - month of year (no leading zero)
          mm - month of year (two digit)
          M  - month name short
          MM - month name long
          y  - year (two digit)
          yy - year (four digit)
          @ - Unix timestamp (ms since 01/01/1970)
          ! - Windows ticks (100ns since 01/01/0001)
          '...' - literal text
          '' - single quote

          @param  format    string - the desired format of the date
          @param  date      Date - the date value to format
          @param  settings  Object - attributes include:
          dayNamesShort    string[7] - abbreviated names of the days from Sunday (optional)
          dayNames         string[7] - names of the days from Sunday (optional)
          monthNamesShort  string[12] - abbreviated names of the months (optional)
          monthNames       string[12] - names of the months (optional)
          @return  string - the date in the above format */
         formatDate: function (format, date, settings) {
             if (!date)
                 return '';
             var dayNamesShort = (settings ? settings.dayNamesShort : null) || this._defaults.dayNamesShort;
             var dayNames = (settings ? settings.dayNames : null) || this._defaults.dayNames;
             var monthNamesShort = (settings ? settings.monthNamesShort : null) || this._defaults.monthNamesShort;
             var monthNames = (settings ? settings.monthNames : null) || this._defaults.monthNames;
             // Check whether a format character is doubled
             var lookAhead = function (match) {
                 var matches = (iFormat + 1 < format.length && format.charAt(iFormat + 1) == match);
                 if (matches)
                     iFormat++;
                 return matches;
             };
             // Format a number, with leading zero if necessary
             var formatNumber = function (match, value, len) {
                 var num = '' + value;
                 if (lookAhead(match))
                     while (num.length < len)
                         num = '0' + num;
                 return num;
             };
             // Format a name, short or long as requested
             var formatName = function (match, value, shortNames, longNames) {
                 return (lookAhead(match) ? longNames[value] : shortNames[value]);
             };
             var output = '';
             var literal = false;
             if (date)
                 for (var iFormat = 0; iFormat < format.length; iFormat++) {
                     if (literal)
                         if (format.charAt(iFormat) == "'" && !lookAhead("'"))
                             literal = false;
                         else
                             output += format.charAt(iFormat);
                     else
                         switch (format.charAt(iFormat)) {
                             case 'd':
                                 output += formatNumber('d', date.getDate(), 2);
                                 break;
                             case 'D':
                                 output += formatName('D', date.getDay(), dayNamesShort, dayNames);
                                 break;
                             case 'o':
                                 output += formatNumber('o',
                                     Math.round((new Date(date.getFullYear(), date.getMonth(), date.getDate()).getTime() - new Date(date.getFullYear(), 0, 0).getTime()) / 86400000), 3);
                                 break;
                             case 'm':
                                 output += formatNumber('m', date.getMonth() + 1, 2);
                                 break;
                             case 'M':
                                 output += formatName('M', date.getMonth(), monthNamesShort, monthNames);
                                 break;
                             case 'y':
                                 output += (lookAhead('y') ? date.getFullYear() :
                                 (date.getYear() % 100 < 10 ? '0' : '') + date.getYear() % 100);
                                 break;
                             case '@':
                                 output += date.getTime();
                                 break;
                             case '!':
                                 output += date.getTime() * 10000 + this._ticksTo1970;
                                 break;
                             case "'":
                                 if (lookAhead("'"))
                                     output += "'";
                                 else
                                     literal = true;
                                 break;
                             default:
                                 output += format.charAt(iFormat);
                         }
                 }
             return output;
         },

         /* Extract all possible characters from the date format. */
         _possibleChars: function (format) {
             var chars = '';
             var literal = false;
             // Check whether a format character is doubled
             var lookAhead = function (match) {
                 var matches = (iFormat + 1 < format.length && format.charAt(iFormat + 1) == match);
                 if (matches)
                     iFormat++;
                 return matches;
             };
             for (var iFormat = 0; iFormat < format.length; iFormat++)
                 if (literal)
                     if (format.charAt(iFormat) == "'" && !lookAhead("'"))
                         literal = false;
                     else
                         chars += format.charAt(iFormat);
                 else
                     switch (format.charAt(iFormat)) {
                         case 'd':
                         case 'm':
                         case 'y':
                         case '@':
                             chars += '0123456789';
                             break;
                         case 'D':
                         case 'M':
                             return null; // Accept anything
                         case "'":
                             if (lookAhead("'"))
                                 chars += "'";
                             else
                                 literal = true;
                             break;
                         default:
                             chars += format.charAt(iFormat);
                     }
             return chars;
         },

         /* Get a setting value, defaulting if necessary. */
         _get: function (inst, name) {
             return inst.settings[name] !== undefined ?
                 inst.settings[name] : this._defaults[name];
         },

         /* Parse existing date and initialise date picker. */
         _setDateFromField: function (inst, noDefault) {
             if (inst.input.val() == inst.lastVal) {
                 return;
             }
             var dateFormat = this._get(inst, 'dateFormat');
             var dates = inst.lastVal = inst.input ? inst.input.val() : null;
             var date, defaultDate;
             date = defaultDate = this._getDefaultDate(inst);
             var settings = this._getFormatConfig(inst);
             try {
                 date = this.parseDate(dateFormat, dates, settings) || defaultDate;
             } catch (event) {
                 this.log(event);
                 dates = (noDefault ? '' : dates);
             }
             inst.selectedDay = date.getDate();
             inst.drawMonth = inst.selectedMonth = date.getMonth();
             inst.drawYear = inst.selectedYear = date.getFullYear();
             inst.currentDay = (dates ? date.getDate() : 0);
             inst.currentMonth = (dates ? date.getMonth() : 0);
             inst.currentYear = (dates ? date.getFullYear() : 0);
             this._adjustInstDate(inst);
         },

         /* Retrieve the default date shown on opening. */
         _getDefaultDate: function (inst) {
             return this._restrictMinMax(inst,
                 this._determineDate(inst, this._get(inst, 'defaultDate'), new Date()));
         },

         /* A date may be specified as an exact value or a relative one. */
         _determineDate: function (inst, date, defaultDate) {
             var offsetNumeric = function (offset) {
                 var date = new Date();
                 date.setDate(date.getDate() + offset);
                 return date;
             };
             var offsetString = function (offset) {
                 try {
                     return $.datepicker.parseDate($.datepicker._get(inst, 'dateFormat'),
                         offset, $.datepicker._getFormatConfig(inst));
                 }
                 catch (e) {
                     // Ignore
                 }
                 var date = (offset.toLowerCase().match(/^c/) ?
                         $.datepicker._getDate(inst) : null) || new Date();
                 var year = date.getFullYear();
                 var month = date.getMonth();
                 var day = date.getDate();
                 var pattern = /([+-]?[0-9]+)\s*(d|D|w|W|m|M|y|Y)?/g;
                 var matches = pattern.exec(offset);
                 while (matches) {
                     switch (matches[2] || 'd') {
                         case 'd' :
                         case 'D' :
                             day += parseInt(matches[1], 10);
                             break;
                         case 'w' :
                         case 'W' :
                             day += parseInt(matches[1], 10) * 7;
                             break;
                         case 'm' :
                         case 'M' :
                             month += parseInt(matches[1], 10);
                             day = Math.min(day, $.datepicker._getDaysInMonth(year, month));
                             break;
                         case 'y':
                         case 'Y' :
                             year += parseInt(matches[1], 10);
                             day = Math.min(day, $.datepicker._getDaysInMonth(year, month));
                             break;
                     }
                     matches = pattern.exec(offset);
                 }
                 return new Date(year, month, day);
             };
             var newDate = (date == null || date === '' ? defaultDate : (typeof date == 'string' ? offsetString(date) :
                 (typeof date == 'number' ? (isNaN(date) ? defaultDate : offsetNumeric(date)) : new Date(date.getTime()))));
             newDate = (newDate && newDate.toString() == 'Invalid Date' ? defaultDate : newDate);
             if (newDate) {
                 newDate.setHours(0);
                 newDate.setMinutes(0);
                 newDate.setSeconds(0);
                 newDate.setMilliseconds(0);
             }
             return this._daylightSavingAdjust(newDate);
         },

         /* Handle switch to/from daylight saving.
          Hours may be non-zero on daylight saving cut-over:
          > 12 when midnight changeover, but then cannot generate
          midnight datetime, so jump to 1AM, otherwise reset.
          @param  date  (Date) the date to check
          @return  (Date) the corrected date */
         _daylightSavingAdjust: function (date) {
             if (!date) return null;
             date.setHours(date.getHours() > 12 ? date.getHours() + 2 : 0);
             return date;
         },

         /* Set the date(s) directly. */
         _setDate: function (inst, date, noChange) {
             var clear = !date;
             var origMonth = inst.selectedMonth;
             var origYear = inst.selectedYear;
             var newDate = this._restrictMinMax(inst, this._determineDate(inst, date, new Date()));
             inst.selectedDay = inst.currentDay = newDate.getDate();
             inst.drawMonth = inst.selectedMonth = inst.currentMonth = newDate.getMonth();
             inst.drawYear = inst.selectedYear = inst.currentYear = newDate.getFullYear();
             if ((origMonth != inst.selectedMonth || origYear != inst.selectedYear) && !noChange)
                 this._notifyChange(inst);
             this._adjustInstDate(inst);
             if (inst.input) {
                 inst.input.val(clear ? '' : this._formatDate(inst));
             }
         },

         /* Retrieve the date(s) directly. */
         _getDate: function (inst) {
             var startDate = (!inst.currentYear || (inst.input && inst.input.val() == '') ? null :
                 this._daylightSavingAdjust(new Date(
                     inst.currentYear, inst.currentMonth, inst.currentDay)));
             return startDate;
         },

         /* Attach the onxxx handlers.  These are declared statically so
          * they work with static code transformers like Caja.
          */
         _attachHandlers: function (inst) {
             var stepMonths = this._get(inst, 'stepMonths');
             var id = '#' + inst.id.replace(/\\\\/g, "\\");
             inst.dpDiv.find('[data-handler]').map(function () {
                 var handler = {
                     prev: function () {
                         window['DP_jQuery_' + dpuuid].datepicker._adjustDate(id, -stepMonths, 'M');
                     },
                     next: function () {
                         window['DP_jQuery_' + dpuuid].datepicker._adjustDate(id, +stepMonths, 'M');
                     },
                     hide: function () {
                         window['DP_jQuery_' + dpuuid].datepicker._hideDatepicker();
                     },
                     today: function () {
                         window['DP_jQuery_' + dpuuid].datepicker._gotoToday(id);
                     },
                     selectDay: function () {
                         window['DP_jQuery_' + dpuuid].datepicker._selectDay(id, +this.getAttribute('data-month'), +this.getAttribute('data-year'), this);
                         return false;
                     },
                     selectMonth: function () {
                         window['DP_jQuery_' + dpuuid].datepicker._selectMonthYear(id, this, 'M');
                         return false;
                     },
                     selectYear: function () {
                         window['DP_jQuery_' + dpuuid].datepicker._selectMonthYear(id, this, 'Y');
                         return false;
                     }
                 };
                 $(this).bind(this.getAttribute('data-event'), handler[this.getAttribute('data-handler')]);
             });
         },

         /* Generate the HTML for the current state of the date picker. */
         _generateHTML: function (inst) {
             var today = new Date();
             today = this._daylightSavingAdjust(
                 new Date(today.getFullYear(), today.getMonth(), today.getDate())); // clear time
             var isRTL = this._get(inst, 'isRTL');
             var showButtonPanel = this._get(inst, 'showButtonPanel');
             var hideIfNoPrevNext = this._get(inst, 'hideIfNoPrevNext');
             var navigationAsDateFormat = this._get(inst, 'navigationAsDateFormat');
             var numMonths = this._getNumberOfMonths(inst);
             var showCurrentAtPos = this._get(inst, 'showCurrentAtPos');
             var stepMonths = this._get(inst, 'stepMonths');
             var isMultiMonth = (numMonths[0] != 1 || numMonths[1] != 1);
             var currentDate = this._daylightSavingAdjust((!inst.currentDay ? new Date(9999, 9, 9) :
                 new Date(inst.currentYear, inst.currentMonth, inst.currentDay)));
             var minDate = this._getMinMaxDate(inst, 'min');
             var maxDate = this._getMinMaxDate(inst, 'max');
             var drawMonth = inst.drawMonth - showCurrentAtPos;
             var drawYear = inst.drawYear;
             if (drawMonth < 0) {
                 drawMonth += 12;
                 drawYear--;
             }
             if (maxDate) {
                 var maxDraw = this._daylightSavingAdjust(new Date(maxDate.getFullYear(),
                     maxDate.getMonth() - (numMonths[0] * numMonths[1]) + 1, maxDate.getDate()));
                 maxDraw = (minDate && maxDraw < minDate ? minDate : maxDraw);
                 while (this._daylightSavingAdjust(new Date(drawYear, drawMonth, 1)) > maxDraw) {
                     drawMonth--;
                     if (drawMonth < 0) {
                         drawMonth = 11;
                         drawYear--;
                     }
                 }
             }
             inst.drawMonth = drawMonth;
             inst.drawYear = drawYear;
             var prevText = this._get(inst, 'prevText');
             prevText = (!navigationAsDateFormat ? prevText : this.formatDate(prevText,
                 this._daylightSavingAdjust(new Date(drawYear, drawMonth - stepMonths, 1)),
                 this._getFormatConfig(inst)));
             var prev = (this._canAdjustMonth(inst, -1, drawYear, drawMonth) ?
             '<a class="ui-datepicker-prev ui-corner-all" data-handler="prev" data-event="click"' +
             ' title="' + prevText + '"><span class="ui-icon ui-icon-circle-triangle-' + ( isRTL ? 'e' : 'w') + '">' + prevText + '</span></a>' :
                 (hideIfNoPrevNext ? '' : '<a class="ui-datepicker-prev ui-corner-all ui-state-disabled" title="' + prevText + '"><span class="ui-icon ui-icon-circle-triangle-' + ( isRTL ? 'e' : 'w') + '">' + prevText + '</span></a>'));
             var nextText = this._get(inst, 'nextText');
             nextText = (!navigationAsDateFormat ? nextText : this.formatDate(nextText,
                 this._daylightSavingAdjust(new Date(drawYear, drawMonth + stepMonths, 1)),
                 this._getFormatConfig(inst)));
             var next = (this._canAdjustMonth(inst, +1, drawYear, drawMonth) ?
             '<a class="ui-datepicker-next ui-corner-all" data-handler="next" data-event="click"' +
             ' title="' + nextText + '"><span class="ui-icon ui-icon-circle-triangle-' + ( isRTL ? 'w' : 'e') + '">' + nextText + '</span></a>' :
                 (hideIfNoPrevNext ? '' : '<a class="ui-datepicker-next ui-corner-all ui-state-disabled" title="' + nextText + '"><span class="ui-icon ui-icon-circle-triangle-' + ( isRTL ? 'w' : 'e') + '">' + nextText + '</span></a>'));
             var currentText = this._get(inst, 'currentText');
             var gotoDate = (this._get(inst, 'gotoCurrent') && inst.currentDay ? currentDate : today);
             currentText = (!navigationAsDateFormat ? currentText :
                 this.formatDate(currentText, gotoDate, this._getFormatConfig(inst)));
             var controls = (!inst.inline ? '<button type="button" class="ui-datepicker-close ui-state-default ui-priority-primary ui-corner-all" data-handler="hide" data-event="click">' +
             this._get(inst, 'closeText') + '</button>' : '');
             var buttonPanel = (showButtonPanel) ? '<div class="ui-datepicker-buttonpane ui-widget-content">' + (isRTL ? controls : '') +
             (this._isInRange(inst, gotoDate) ? '<button type="button" class="ui-datepicker-current ui-state-default ui-priority-secondary ui-corner-all" data-handler="today" data-event="click"' +
             '>' + currentText + '</button>' : '') + (isRTL ? '' : controls) + '</div>' : '';
             var firstDay = parseInt(this._get(inst, 'firstDay'), 10);
             firstDay = (isNaN(firstDay) ? 0 : firstDay);
             var showWeek = this._get(inst, 'showWeek');
             var dayNames = this._get(inst, 'dayNames');
             var dayNamesShort = this._get(inst, 'dayNamesShort');
             var dayNamesMin = this._get(inst, 'dayNamesMin');
             var monthNames = this._get(inst, 'monthNames');
             var monthNamesShort = this._get(inst, 'monthNamesShort');
             var beforeShowDay = this._get(inst, 'beforeShowDay');
             var showOtherMonths = this._get(inst, 'showOtherMonths');
             var selectOtherMonths = this._get(inst, 'selectOtherMonths');
             var calculateWeek = this._get(inst, 'calculateWeek') || this.iso8601Week;
             var defaultDate = this._getDefaultDate(inst);
             var html = '';
             for (var row = 0; row < numMonths[0]; row++) {
                 var group = '';
                 this.maxRows = 4;
                 for (var col = 0; col < numMonths[1]; col++) {
                     var selectedDate = this._daylightSavingAdjust(new Date(drawYear, drawMonth, inst.selectedDay));
                     var cornerClass = ' ui-corner-all';
                     var calender = '';
                     if (isMultiMonth) {
                         calender += '<div class="ui-datepicker-group';
                         if (numMonths[1] > 1)
                             switch (col) {
                                 case 0:
                                     calender += ' ui-datepicker-group-first';
                                     cornerClass = ' ui-corner-' + (isRTL ? 'right' : 'left');
                                     break;
                                 case numMonths[1] - 1:
                                     calender += ' ui-datepicker-group-last';
                                     cornerClass = ' ui-corner-' + (isRTL ? 'left' : 'right');
                                     break;
                                 default:
                                     calender += ' ui-datepicker-group-middle';
                                     cornerClass = '';
                                     break;
                             }
                         calender += '">';
                     }
                     calender += '<div class="ui-datepicker-header ui-widget-header ui-helper-clearfix' + cornerClass + '">' +
                         (/all|left/.test(cornerClass) && row == 0 ? (isRTL ? next : prev) : '') +
                         (/all|right/.test(cornerClass) && row == 0 ? (isRTL ? prev : next) : '') +
                         this._generateMonthYearHeader(inst, drawMonth, drawYear, minDate, maxDate,
                             row > 0 || col > 0, monthNames, monthNamesShort) + // draw month headers
                         '</div><table class="ui-datepicker-calendar"><thead>' +
                         '<tr>';
                     var thead = (showWeek ? '<th class="ui-datepicker-week-col">' + this._get(inst, 'weekHeader') + '</th>' : '');
                     for (var dow = 0; dow < 7; dow++) { // days of the week
                         var day = (dow + firstDay) % 7;
                         thead += '<th' + ((dow + firstDay + 6) % 7 >= 5 ? ' class="ui-datepicker-week-end"' : '') + '>' +
                             '<span title="' + dayNames[day] + '">' + dayNamesMin[day] + '</span></th>';
                     }
                     calender += thead + '</tr></thead><tbody>';
                     var daysInMonth = this._getDaysInMonth(drawYear, drawMonth);
                     if (drawYear == inst.selectedYear && drawMonth == inst.selectedMonth)
                         inst.selectedDay = Math.min(inst.selectedDay, daysInMonth);
                     var leadDays = (this._getFirstDayOfMonth(drawYear, drawMonth) - firstDay + 7) % 7;
                     var curRows = Math.ceil((leadDays + daysInMonth) / 7); // calculate the number of rows to generate
                     var numRows = (isMultiMonth ? this.maxRows > curRows ? this.maxRows : curRows : curRows); //If multiple months, use the higher number of rows (see #7043)
                     this.maxRows = numRows;
                     var printDate = this._daylightSavingAdjust(new Date(drawYear, drawMonth, 1 - leadDays));
                     for (var dRow = 0; dRow < numRows; dRow++) { // create date picker rows
                         calender += '<tr>';
                         var tbody = (!showWeek ? '' : '<td class="ui-datepicker-week-col">' +
                         this._get(inst, 'calculateWeek')(printDate) + '</td>');
                         for (var dow = 0; dow < 7; dow++) { // create date picker days
                             var daySettings = (beforeShowDay ?
                                 beforeShowDay.apply((inst.input ? inst.input[0] : null), [printDate]) : [true, '']);
                             var otherMonth = (printDate.getMonth() != drawMonth);
                             var unselectable = (otherMonth && !selectOtherMonths) || !daySettings[0] ||
                                 (minDate && printDate < minDate) || (maxDate && printDate > maxDate);
                             tbody += '<td class="' +
                                 ((dow + firstDay + 6) % 7 >= 5 ? ' ui-datepicker-week-end' : '') + // highlight weekends
                                 (otherMonth ? ' ui-datepicker-other-month' : '') + // highlight days from other months
                                 ((printDate.getTime() == selectedDate.getTime() && drawMonth == inst.selectedMonth && inst._keyEvent) || // user pressed key
                                 (defaultDate.getTime() == printDate.getTime() && defaultDate.getTime() == selectedDate.getTime()) ?
                                     // or defaultDate is current printedDate and defaultDate is selectedDate
                                 ' ' + this._dayOverClass : '') + // highlight selected day
                                 (unselectable ? ' ' + this._unselectableClass + ' ui-state-disabled' : '') +  // highlight unselectable days
                                 (otherMonth && !showOtherMonths ? '' : ' ' + daySettings[1] + // highlight custom dates
                                 (printDate.getTime() == currentDate.getTime() ? ' ' + this._currentClass : '') + // highlight selected day
                                 (printDate.getTime() == today.getTime() ? ' ui-datepicker-today' : '')) + '"' + // highlight today (if different)
                                 ((!otherMonth || showOtherMonths) && daySettings[2] ? ' title="' + daySettings[2] + '"' : '') + // cell title
                                 (unselectable ? '' : ' data-handler="selectDay" data-event="click" data-month="' + printDate.getMonth() + '" data-year="' + printDate.getFullYear() + '"') + '>' + // actions
                                 (otherMonth && !showOtherMonths ? '&#xa0;' : // display for other months
                                     (unselectable ? '<span class="ui-state-default">' + printDate.getDate() + '</span>' : '<a class="ui-state-default' +
                                     (printDate.getTime() == today.getTime() ? ' ui-state-highlight' : '') +
                                     (printDate.getTime() == currentDate.getTime() ? ' ui-state-active' : '') + // highlight selected day
                                     (otherMonth ? ' ui-priority-secondary' : '') + // distinguish dates from other months
                                     '" href="#">' + printDate.getDate() + '</a>')) + '</td>'; // display selectable date
                             printDate.setDate(printDate.getDate() + 1);
                             printDate = this._daylightSavingAdjust(printDate);
                         }
                         calender += tbody + '</tr>';
                     }
                     drawMonth++;
                     if (drawMonth > 11) {
                         drawMonth = 0;
                         drawYear++;
                     }
                     calender += '</tbody></table>' + (isMultiMonth ? '</div>' +
                         ((numMonths[0] > 0 && col == numMonths[1] - 1) ? '<div class="ui-datepicker-row-break"></div>' : '') : '');
                     group += calender;
                 }
                 html += group;
             }
             html += buttonPanel + ($.ui.ie6 && !inst.inline ?
                     '<iframe src="javascript:false;" class="ui-datepicker-cover" frameborder="0"></iframe>' : '');
             inst._keyEvent = false;
             return html;
         },

         /* Generate the month and year header. */
         _generateMonthYearHeader: function (inst, drawMonth, drawYear, minDate, maxDate,
                                             secondary, monthNames, monthNamesShort) {
             var changeMonth = this._get(inst, 'changeMonth');
             var changeYear = this._get(inst, 'changeYear');
             var showMonthAfterYear = this._get(inst, 'showMonthAfterYear');
             var html = '<div class="ui-datepicker-title">';
             var monthHtml = '';
             // month selection
             if (secondary || !changeMonth)
                 monthHtml += '<span class="ui-datepicker-month">' + monthNames[drawMonth] + '</span>';
             else {
                 var inMinYear = (minDate && minDate.getFullYear() == drawYear);
                 var inMaxYear = (maxDate && maxDate.getFullYear() == drawYear);
                 monthHtml += '<select class="ui-datepicker-month" data-handler="selectMonth" data-event="change">';
                 for (var month = 0; month < 12; month++) {
                     if ((!inMinYear || month >= minDate.getMonth()) &&
                         (!inMaxYear || month <= maxDate.getMonth()))
                         monthHtml += '<option value="' + month + '"' +
                             (month == drawMonth ? ' selected="selected"' : '') +
                             '>' + monthNamesShort[month] + '</option>';
                 }
                 monthHtml += '</select>';
             }
             if (!showMonthAfterYear)
                 html += monthHtml + (secondary || !(changeMonth && changeYear) ? '&#xa0;' : '');
             // year selection
             if (!inst.yearshtml) {
                 inst.yearshtml = '';
                 if (secondary || !changeYear)
                     html += '<span class="ui-datepicker-year">' + drawYear + '</span>';
                 else {
                     // determine range of years to display
                     var years = this._get(inst, 'yearRange').split(':');
                     var thisYear = new Date().getFullYear();
                     var determineYear = function (value) {
                         var year = (value.match(/c[+-].*/) ? drawYear + parseInt(value.substring(1), 10) :
                             (value.match(/[+-].*/) ? thisYear + parseInt(value, 10) :
                                 parseInt(value, 10)));
                         return (isNaN(year) ? thisYear : year);
                     };
                     var year = determineYear(years[0]);
                     var endYear = Math.max(year, determineYear(years[1] || ''));
                     year = (minDate ? Math.max(year, minDate.getFullYear()) : year);
                     endYear = (maxDate ? Math.min(endYear, maxDate.getFullYear()) : endYear);
                     inst.yearshtml += '<select class="ui-datepicker-year" data-handler="selectYear" data-event="change">';
                     for (; year <= endYear; year++) {
                         inst.yearshtml += '<option value="' + year + '"' +
                             (year == drawYear ? ' selected="selected"' : '') +
                             '>' + year + '</option>';
                     }
                     inst.yearshtml += '</select>';

                     html += inst.yearshtml;
                     inst.yearshtml = null;
                 }
             }
             html += this._get(inst, 'yearSuffix');
             if (showMonthAfterYear)
                 html += (secondary || !(changeMonth && changeYear) ? '&#xa0;' : '') + monthHtml;
             html += '</div>'; // Close datepicker_header
             return html;
         },

         /* Adjust one of the date sub-fields. */
         _adjustInstDate: function (inst, offset, period) {
             var year = inst.drawYear + (period == 'Y' ? offset : 0);
             var month = inst.drawMonth + (period == 'M' ? offset : 0);
             var day = Math.min(inst.selectedDay, this._getDaysInMonth(year, month)) +
                 (period == 'D' ? offset : 0);
             var date = this._restrictMinMax(inst,
                 this._daylightSavingAdjust(new Date(year, month, day)));
             inst.selectedDay = date.getDate();
             inst.drawMonth = inst.selectedMonth = date.getMonth();
             inst.drawYear = inst.selectedYear = date.getFullYear();
             if (period == 'M' || period == 'Y')
                 this._notifyChange(inst);
         },

         /* Ensure a date is within any min/max bounds. */
         _restrictMinMax: function (inst, date) {
             var minDate = this._getMinMaxDate(inst, 'min');
             var maxDate = this._getMinMaxDate(inst, 'max');
             var newDate = (minDate && date < minDate ? minDate : date);
             newDate = (maxDate && newDate > maxDate ? maxDate : newDate);
             return newDate;
         },

         /* Notify change of month/year. */
         _notifyChange: function (inst) {
             var onChange = this._get(inst, 'onChangeMonthYear');
             if (onChange)
                 onChange.apply((inst.input ? inst.input[0] : null),
                     [inst.selectedYear, inst.selectedMonth + 1, inst]);
         },

         /* Determine the number of months to show. */
         _getNumberOfMonths: function (inst) {
             var numMonths = this._get(inst, 'numberOfMonths');
             return (numMonths == null ? [1, 1] : (typeof numMonths == 'number' ? [1, numMonths] : numMonths));
         },

         /* Determine the current maximum date - ensure no time components are set. */
         _getMinMaxDate: function (inst, minMax) {
             return this._determineDate(inst, this._get(inst, minMax + 'Date'), null);
         },

         /* Find the number of days in a given month. */
         _getDaysInMonth: function (year, month) {
             return 32 - this._daylightSavingAdjust(new Date(year, month, 32)).getDate();
         },

         /* Find the day of the week of the first of a month. */
         _getFirstDayOfMonth: function (year, month) {
             return new Date(year, month, 1).getDay();
         },

         /* Determines if we should allow a "next/prev" month display change. */
         _canAdjustMonth: function (inst, offset, curYear, curMonth) {
             var numMonths = this._getNumberOfMonths(inst);
             var date = this._daylightSavingAdjust(new Date(curYear,
                 curMonth + (offset < 0 ? offset : numMonths[0] * numMonths[1]), 1));
             if (offset < 0)
                 date.setDate(this._getDaysInMonth(date.getFullYear(), date.getMonth()));
             return this._isInRange(inst, date);
         },

         /* Is the given date in the accepted range? */
         _isInRange: function (inst, date) {
             var minDate = this._getMinMaxDate(inst, 'min');
             var maxDate = this._getMinMaxDate(inst, 'max');
             return ((!minDate || date.getTime() >= minDate.getTime()) &&
             (!maxDate || date.getTime() <= maxDate.getTime()));
         },

         /* Provide the configuration settings for formatting/parsing. */
         _getFormatConfig: function (inst) {
             var shortYearCutoff = this._get(inst, 'shortYearCutoff');
             shortYearCutoff = (typeof shortYearCutoff != 'string' ? shortYearCutoff :
             new Date().getFullYear() % 100 + parseInt(shortYearCutoff, 10));
             return {
                 shortYearCutoff: shortYearCutoff,
                 dayNamesShort: this._get(inst, 'dayNamesShort'), dayNames: this._get(inst, 'dayNames'),
                 monthNamesShort: this._get(inst, 'monthNamesShort'), monthNames: this._get(inst, 'monthNames')
             };
         },

         /* Format the given date for display. */
         _formatDate: function (inst, day, month, year) {
             if (!day) {
                 inst.currentDay = inst.selectedDay;
                 inst.currentMonth = inst.selectedMonth;
                 inst.currentYear = inst.selectedYear;
             }
             var date = (day ? (typeof day == 'object' ? day :
                 this._daylightSavingAdjust(new Date(year, month, day))) :
                 this._daylightSavingAdjust(new Date(inst.currentYear, inst.currentMonth, inst.currentDay)));
             return this.formatDate(this._get(inst, 'dateFormat'), date, this._getFormatConfig(inst));
         }
     });

     /*
      * Bind hover events for datepicker elements.
      * Done via delegate so the binding only occurs once in the lifetime of the parent div.
      * Global instActive, set by _updateDatepicker allows the handlers to find their way back to the active picker.
      */
     function bindHover(dpDiv) {
         var selector = 'button, .ui-datepicker-prev, .ui-datepicker-next, .ui-datepicker-calendar td a';
         return dpDiv.delegate(selector, 'mouseout', function () {
             $(this).removeClass('ui-state-hover');
             if (this.className.indexOf('ui-datepicker-prev') != -1) $(this).removeClass('ui-datepicker-prev-hover');
             if (this.className.indexOf('ui-datepicker-next') != -1) $(this).removeClass('ui-datepicker-next-hover');
         })
             .delegate(selector, 'mouseover', function () {
                 if (!$.datepicker._isDisabledDatepicker(instActive.inline ? dpDiv.parent()[0] : instActive.input[0])) {
                     $(this).parents('.ui-datepicker-calendar').find('a').removeClass('ui-state-hover');
                     $(this).addClass('ui-state-hover');
                     if (this.className.indexOf('ui-datepicker-prev') != -1) $(this).addClass('ui-datepicker-prev-hover');
                     if (this.className.indexOf('ui-datepicker-next') != -1) $(this).addClass('ui-datepicker-next-hover');
                 }
             });
     }

     /* jQuery extend now ignores nulls! */
     function extendRemove(target, props) {
         $.extend(target, props);
         for (var name in props)
             if (props[name] == null || props[name] == undefined)
                 target[name] = props[name];
         return target;
     };

     /* Invoke the datepicker functionality.
      @param  options  string - a command, optionally followed by additional parameters or
      Object - settings for attaching new datepicker functionality
      @return  jQuery object */
     $.fn.datepicker = function (options) {

         /* Verify an empty collection wasn't passed - Fixes #6976 */
         if (!this.length) {
             return this;
         }

         /* Initialise the date picker. */
         if (!$.datepicker.initialized) {
             $(document).mousedown($.datepicker._checkExternalClick).
                 find(document.body).append($.datepicker.dpDiv);
             $.datepicker.initialized = true;
         }

         var otherArgs = Array.prototype.slice.call(arguments, 1);
         if (typeof options == 'string' && (options == 'isDisabled' || options == 'getDate' || options == 'widget'))
             return $.datepicker['_' + options + 'Datepicker'].
                 apply($.datepicker, [this[0]].concat(otherArgs));
         if (options == 'option' && arguments.length == 2 && typeof arguments[1] == 'string')
             return $.datepicker['_' + options + 'Datepicker'].
                 apply($.datepicker, [this[0]].concat(otherArgs));
         return this.each(function () {
             typeof options == 'string' ?
                 $.datepicker['_' + options + 'Datepicker'].
                     apply($.datepicker, [this].concat(otherArgs)) :
                 $.datepicker._attachDatepicker(this, options);
         });
     };

     $.datepicker = new Datepicker(); // singleton instance
     $.datepicker.initialized = false;
     $.datepicker.uuid = new Date().getTime();
     $.datepicker.version = "1.9.2";

// Workaround for #4055
// Add another global to avoid noConflict issues with inline event handlers
     window['DP_jQuery_' + dpuuid] = $;

 })(jQuery);